Effect of carboxyl-functionalized imidazolium salts on the rhodium-catalyzed hydrosilylation of alkene
作者:Chao Ma、Jiayun Li、Jiajian Peng、Ying Bai、Guodong Zhang、Wenjun Xiao、Guoqiao Lai
DOI:10.1016/j.jorganchem.2012.12.016
日期:2013.3
A series of carboxyl-functionalized imidazolium salts were synthesized. Hydrosilylation reaction of carboxyl-functionalized imidazolium salts (1b–4b, 1c–3c) exhibited higher levels of styrene conversion and higher levels of β-adduct selectivity. In particular, no ethylbenzene as hydrogenation product could be yielded at all when Rh(PPh3)3Cl/carboxyl-functionalized imidazolium inner salts (1c–3c), respectively
合成了一系列羧基官能化的咪唑鎓盐。羧基官能化的咪唑鎓盐(1b - 4b,1c - 3c)的氢化硅烷化反应显示出更高的苯乙烯转化率和更高的β-加合物选择性。特别地,当分别使用Rh(PPh 3)3 Cl /羧基官能化的咪唑鎓内盐(1c - 3c)作为催化剂时,根本无法得到乙苯作为氢化产物。Rh(PPh 3)3Cl /羧基官能化的咪唑鎓盐催化剂体系可以重复使用,而催化活性没有明显损失。